The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed
to detect and map low surface brightness emission, has obtained imaging
spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) of QSO
HS1549+19 at redshift of 2.843. Extensive extended emission is detected from
the CQM, consistent with fluorescent and pumped Ly-alpha produced by the
ionizing and Ly-alpha continuum of the QSO. Many features present in PCWI
spectral images match those detected in narrow-band images. Filamentary
structures with narrow line profiles are detected in several cases as long as
250-400 kpc. One of these is centered at a velocity redshifted with respect to
the systemic velocity, and displays a spatially collimated and kinematically
cold line profile increasing in velocity width approaching the QSO. This
suggests that the filament gas is infalling onto the QSO, perhaps in a cold
accretion flow. Because of the strong ionizing flux, the neutral column density
is low, typically N(HI) is roughly 10E12-10E15/square-cm, and the line center
optical depth is also low (typically tau0 is less than 10), insufficient to
display well-separated double peak emission characteristic of higher line
optical depths. With a simple ionization and cloud model we can very roughly
estimate the total gas mass (log M(gas) equal to 12.5 +/- 0.5) and the total
mass (log M(tot) equal to 13.3+/- 0.5). We can also calculate a kinematic mass
from the total line profile (2x10E13 M(sun)), which agrees with the mass
estimated from the gas emission. The intensity-binned spectrum of the CQM shows
a progression in kinematic properties consistent with heirarchical structure
formation.
Beschreibung
[1402.4816] IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow
cite arxiv:1402.4816Comment: Running title: Cosmic Web Imager Observations of Gas Near QSO 1549+19, Accepted by the Astrophysical Journal, 62 pages, 33 figures
%0 Generic
%1 martin2014emission
%A Martin, D. Christopher
%A Chang, Daphne
%A Matuszewski, Matt
%A Morrissey, Patrick
%A Rahman, Shahin
%A Moore, Anna
%A Steidel, Charles C.
%D 2014
%K Lya cosmic emission imaging web
%T IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO
Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow
%U http://arxiv.org/abs/1402.4816
%X The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed
to detect and map low surface brightness emission, has obtained imaging
spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) of QSO
HS1549+19 at redshift of 2.843. Extensive extended emission is detected from
the CQM, consistent with fluorescent and pumped Ly-alpha produced by the
ionizing and Ly-alpha continuum of the QSO. Many features present in PCWI
spectral images match those detected in narrow-band images. Filamentary
structures with narrow line profiles are detected in several cases as long as
250-400 kpc. One of these is centered at a velocity redshifted with respect to
the systemic velocity, and displays a spatially collimated and kinematically
cold line profile increasing in velocity width approaching the QSO. This
suggests that the filament gas is infalling onto the QSO, perhaps in a cold
accretion flow. Because of the strong ionizing flux, the neutral column density
is low, typically N(HI) is roughly 10E12-10E15/square-cm, and the line center
optical depth is also low (typically tau0 is less than 10), insufficient to
display well-separated double peak emission characteristic of higher line
optical depths. With a simple ionization and cloud model we can very roughly
estimate the total gas mass (log M(gas) equal to 12.5 +/- 0.5) and the total
mass (log M(tot) equal to 13.3+/- 0.5). We can also calculate a kinematic mass
from the total line profile (2x10E13 M(sun)), which agrees with the mass
estimated from the gas emission. The intensity-binned spectrum of the CQM shows
a progression in kinematic properties consistent with heirarchical structure
formation.
@misc{martin2014emission,
abstract = {The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed
to detect and map low surface brightness emission, has obtained imaging
spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) of QSO
HS1549+19 at redshift of 2.843. Extensive extended emission is detected from
the CQM, consistent with fluorescent and pumped Ly-alpha produced by the
ionizing and Ly-alpha continuum of the QSO. Many features present in PCWI
spectral images match those detected in narrow-band images. Filamentary
structures with narrow line profiles are detected in several cases as long as
250-400 kpc. One of these is centered at a velocity redshifted with respect to
the systemic velocity, and displays a spatially collimated and kinematically
cold line profile increasing in velocity width approaching the QSO. This
suggests that the filament gas is infalling onto the QSO, perhaps in a cold
accretion flow. Because of the strong ionizing flux, the neutral column density
is low, typically N(HI) is roughly 10E12-10E15/square-cm, and the line center
optical depth is also low (typically tau0 is less than 10), insufficient to
display well-separated double peak emission characteristic of higher line
optical depths. With a simple ionization and cloud model we can very roughly
estimate the total gas mass (log M(gas) equal to 12.5 +/- 0.5) and the total
mass (log M(tot) equal to 13.3+/- 0.5). We can also calculate a kinematic mass
from the total line profile (2x10E13 M(sun)), which agrees with the mass
estimated from the gas emission. The intensity-binned spectrum of the CQM shows
a progression in kinematic properties consistent with heirarchical structure
formation.},
added-at = {2014-02-28T03:26:09.000+0100},
author = {Martin, D. Christopher and Chang, Daphne and Matuszewski, Matt and Morrissey, Patrick and Rahman, Shahin and Moore, Anna and Steidel, Charles C.},
biburl = {https://www.bibsonomy.org/bibtex/285832661cfc6feca97a835b866c3041f/rasimcoe},
description = {[1402.4816] IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow},
interhash = {899ce8d8fe58298ce5315af2eddcfdc0},
intrahash = {85832661cfc6feca97a835b866c3041f},
keywords = {Lya cosmic emission imaging web},
note = {cite arxiv:1402.4816Comment: Running title: Cosmic Web Imager Observations of Gas Near QSO 1549+19, Accepted by the Astrophysical Journal, 62 pages, 33 figures},
timestamp = {2014-02-28T03:26:09.000+0100},
title = {IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO
Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow},
url = {http://arxiv.org/abs/1402.4816},
year = 2014
}